Metal and concrete structure.



PATENTE!) FEB. l2, 1907.

H. MANNHRDT,

CONCRETE STM GTURB. L'IGATION FILED Nov.7.19o6,

METAL AND APP 5 tective iilm 3.

c tine, carbon UNXTED STATES PATENT. FFM/E0 METAL ANDV CONCRETESTRUCTURE.

Specification of Letters Patent.

Patented Feb. 12, 190'?a Application led November 7.1906. Serial No.342,378.

'I'o /LZL whom trudy concern.-

Be it known that I, HANS MANNHARDT, a citizen ot' the United States ofAmerica, and a resident of Chicago, in the county of Cook and State ofIllinois, have invented certain new and use lul Improvements in Metaland Concrete Structures, of which the following is a specification.

The objects of this invention are to provide an improved buildingstructure in which iron or other corrosive metal is Surrounded by orcovered with concrete and to effectively prevent the corrosion ol" themetal also, to provide for coating the metal Witha protectivenon-corrosive non-.hygro'scopic film alter the inctal structure has beenerected, as in a building, and before the concrete is built up aroundthe saine. These objectsare accomplished by the structure illustrated inthe accompanying drawing and hereinafter described.

The drawing shows a cross-section of a pillar formed of a channel-bar l,surrounded by concrete 2 and having an intervening pro- Heretofore inbuilding structures consisting of corrosive metal surround'- ed byconcrete the metal has usuali been coated with a varnish or paintcontaining a drying-oil and the concrete has then been builtup aroundthis film. The drying-oil used in the lilin causes the film to becomespongy and permeable to moisture through the action of the gasesliberated in the oxidation. This has resulted in thev corrosion andcomparatively rapid deterioration of the metal. Such corrosion can beprevented by avoiding. the use of ,dryingoils and using as a coating forforming the protective iilm soine volatile solvent-such as benzene,benzole, turpendisulfid, carbon tetrachlorid, chloroform, I'nethyl orethyl alcoholin which is held in solution a suitable body iorined ofresins, metallic resinates, vegetable, animal, or mineral oils,(excepting drying-oils,) and fats or waxes or similar materials.

The main feature of the material from which the coating or hn used inthis invention is formed is that it is adhesive and will ow readily, soas to bereadily painted or spread upon the metallic structure after thesame has been erected in a building construction or that it will `form auniform coating' upon the metallic structure When the lat- 4ter isdipped therein and which shall be free from all dr ying-oils, so that insaid coating has volatilized the remaining film will be non-corrosive,non-corrodible, non-permeable to moisture and gases, and nonygroscopic.Such filin may be made by taking a solution containing one part, byweight, of resinate of lime to nine parts, by Weight, of benzene andmixing the same, usually at ordinary temperature, and then brushing orspraying the solution upon the inetal structure and permitting it to drythereon before the concrete is built u around thesame. 'Vhenpracticable, the metal structure may be dipped in a similar solution. Ineither case when the solution dries a film is formed having thecharacteristics -above mentioned. An advantage of using resinate of limein such solution is that the concrete, which contains linie, will notform a disintegrating chemical combination, which might be formed itsome other sub stancese used instead of the resinate of linie as `a'bodyfor the i'ilin.

What I claim as iny invention, and desire to secure by Letters Patent,isi 1. A inetai core having its surface coated with a non-corrosive,non-hygroscopic film formed by the evaporation of a volatile solventcarrying in solution a non-corrosive, non-hygroscopic adhesive body,free from drying-oil, and having a concrete covering in lcontact withsaid film. 2: A metal core having its surface coated with, a film formedby the evaporation of a volatile solvent carrying in solution a resinateof liine, being free from drying-oil, and havinfra concrete covering incontact with said iim. Signed at Chicago this 3d day of November, 1906,y

HANS MANNHARDT.-

when the solvent

